ITEM NAME:3X Single Flute 90 ° Edge Chamfer Countersink Deburring Drill Bit 3/8 1/2 3/4 Z a.imagelink a:hover.imagelink {color:#db3606;.Type: single Flute 90 Degree. 1x 3/8" Drill Bit. 1x 1/2" Drill Bit. 1x 3/4" Drill Bit. Weight: about 65g. Material: High Carbon Steel.